Both Missouri and IL are among the 21 states that the CDC is monitoring for a measles outbreak.
CDC officials stated Tuesday that there have been 107 cases of measles already reported this year across 21 states, the majority of which having been diagnosed in children who have not been vaccinated.
In 2017 alone, there were 118 reported cases of measles.
"Widespread use of the measles vaccine has led to a greater than 99 percent reduction in measles cases compared with the pre-vaccine era", the CDC said.
The CDC says measles is still common in many parts of the world and travelers with measles continue to bring the disease to the US.
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But that is no longer the case, which is why the state is urging people to stay up-to-date on the recommended vaccines.
Symptoms of measles include a fever, cough, runny nose, red eyes and rash (usually starting on the face and spreading down the body). The rash has a particular name: "morbilliform", meaning "measles-like", and begins as flat red spots or bumps which come together in large reddish areas. In 2016, 86 people from 19 states had measles.
Missouri and IL require schoolchildren to get their measles vaccines, but they can be exempted for a medical or religious reason.
The incidences of measles has dropped dramatically since the introduction of a live vaccine in 1963, the CDC said.
What is the treatment for measles? Yet one or two out of every 1,000 children who get measles will die from complications, according to the CDC.